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1.
Mem. Inst. Oswaldo Cruz ; 113(8): e180120, 2018. tab, graf
Article in English | LILACS | ID: biblio-955114

ABSTRACT

BACKGROUND Melanin production has been associated with virulence in various pathogenic fungi, including Fonsecaea pedrosoi, the major etiological agent for chromoblastomycosis, a subcutaneous fungal disease that occurs in South America. OBJECTIVE The aim of this study was to evaluate the effects of acid-basic extracted F. pedrosoi melanin particles and fungal cell ghosts obtained by Novozym 234 treatment on their ability to activate the human complement system. METHODS The ability of melanin particles and fungal cell ghosts to activate the human complement system was evaluated by complement consumption, immunofluorescence, and enzyme-linked immunosorbent assay (ELISA). FINDINGS Unsensitised melanin particles and melanin ghosts presented complement consumption of 82.67 ± 2.08% and 96.04 ± 1.13%, respectively. Immunofluorescence assays revealed intense deposition of the C3 and C4 fragments on the surface of melanin particles and ghosts extracted from F. pedrosoi. Deposition of the C3, C4, and C5 fragments onto melanin samples and zymosan was confirmed by ELISA. Deposition of small amounts of C1q and C9 onto melanin samples and zymosan was detected by ELISA. CONCLUSION Fonsecaea pedrosoi melanin particles and fungal cell ghosts activated the complement system mainly through an alternative pathway.


Subject(s)
Humans , Ascomycota/chemistry , Complement Activation , Melanins/isolation & purification , Melanins/biosynthesis , Enzyme-Linked Immunosorbent Assay , Fluorescent Antibody Technique
2.
Braz. j. microbiol ; 44(3): 869-872, July-Sept. 2013. tab
Article in English | LILACS | ID: lil-699819

ABSTRACT

GBS serotypes III and V were the most prevalent in pregnant women and exhibited resistance to tetracycline, clindamycin and sulfamethoxazole/trimethoprim. Serotype III showed high sialic acid content and PFGE analysis discerned 33 heterogeneous profiles. Phenotypic and genotypic characterization could be relevant to control GBS infections unaffected by intra-partum chemoprophylaxis.


Subject(s)
Female , Humans , Infant, Newborn , Pregnancy , Pregnancy Complications, Infectious/epidemiology , Serogroup , Streptococcal Infections/epidemiology , Streptococcus agalactiae/isolation & purification , Anti-Bacterial Agents/pharmacology , Brazil/epidemiology , Cluster Analysis , Drug Resistance, Bacterial , Electrophoresis, Gel, Pulsed-Field , Genotype , Molecular Typing , Prevalence , Pregnancy Complications, Infectious/microbiology , Streptococcal Infections/microbiology , Streptococcus agalactiae/classification , Streptococcus agalactiae/drug effects
3.
Braz. dent. j ; 23(4): 422-427, 2012. ilus, tab
Article in English | LILACS | ID: lil-658021

ABSTRACT

Peri-implant inflammation contributes for loss of secondary stability of orthodontic mini-implants. The investigation of microbial colonization in this area would benefit its control, and consequently favor the long-term success of mini-implants. Therefore, the aim of this study was to determine the establishment and the evolution of microbial colonization process in orthodontic mini-implants for 3 months, since the time of their installation. One-hundred and fifty samples collected from 15 mini-implants were investigated from baseline up to 3 months. The biological material was obtained from peri-implant area using paper points. Nonspecific, Streptococcus spp, Lactobacillus casei and Candida spp colonizations were analyzed by cell growth methods. Porphyromonas gingivalis colonization was observed by 16S rDNA-directed polymerase chain reaction. Data from cell growth were submitted to the Wilcoxon sign rank test and results from molecular analysis were presented in a descriptive way. There was no significant difference in the microbial colonization among the examined time intervals, except for Streptococcus spp, between baseline and 24 h, which characterized the initial colonization in this time interval. Lactobacillus casei and Candida spp colonizations were insignificant. No Porphyromonas gingivalis was detected among the analyzed samples. The microbial colonization of mini-implants did not significantly change during the study. However, it should be monitored by orthodontists, since it is an important factor for mini-implants success.


A inflamação peri-implantar contribui para a perda da estabilidade secundária dos mini-implantes ortodônticos. A investigação da colonização microbiana desta área beneficiaria o seu controle e, consequentemente, favoreceria o sucesso dos mini-implantes a longo prazo. Portanto, o objetivo dos autores foi determinar o estabelecimento e evolução do processo de colonização microbiana em mini-implantes ortodônticos por três meses desde a instalação. Cento e cinquenta amostras coletadas de 15 mini-implantes foram investigadas desde o tempo inicial até 3 meses. O material biológico foi obtido da área peri-implantar com auxílio de cones de papel absorvente. As colonizações inespecíficas de Streptococcus spp, Lactobacillus casei e Candida spp foram analisadas por métodos de crescimento celular. A colonização por Porphyromonas gingivalis foi observada por meio da reação em cadeia da polimerase 16S rDNA. Os dados do crescimento celular foram submetidos ao teste de Wilcoxon sign rank e os resultados da biologia molecular foram apresentados de modo descritivo. Não houve diferença estatisticamente significante da colonização microbiana entre os intervalos de tempo avaliados, exceto para Streptococcus spp entre os tempos inicial e 24 h, o que caracterizou o início da colonização neste intervalo de tempo. As colonizações por Lactobacillus casei e Candida spp foram insignificantes. Não foi detectada a presença de Porphyromonas gingivalis nas amostras analisadas. A colonização microbiana nos mini-implantes não se alterou significativamente durante o estudo. No entanto, deve ser monitorada por ortodontistas, uma vez que é um fator importante para o sucesso dos mini-implantes.


Subject(s)
Adolescent , Female , Humans , Male , Young Adult , Bacteria/growth & development , Dental Implants/microbiology , Orthodontic Anchorage Procedures/instrumentation , Anti-Infective Agents, Local/therapeutic use , Bacterial Load , Bacteriological Techniques , Bacteria/classification , Candida/growth & development , Chlorhexidine/therapeutic use , Dental Alloys/chemistry , Follow-Up Studies , Lacticaseibacillus casei/growth & development , Mouthwashes/therapeutic use , Oral Hygiene/education , Polymerase Chain Reaction , Porphyromonas gingivalis/classification , Porphyromonas gingivalis/growth & development , RNA, Bacterial/analysis , /analysis , Streptococcus/classification , Streptococcus/growth & development , Titanium/chemistry , Tooth Movement Techniques/instrumentation , Toothbrushing/methods
4.
RBM rev. bras. med ; 56(1/2): 42-50, jan.-fev. 1999. tab
Article in Portuguese | LILACS | ID: lil-234781

ABSTRACT

O uso de saboes e/ou anti-septicos para lavagem das maos e uma pratica corriqueira pra qualquer profissional clinico da are ada saude.Entretanto,a despeito de seu largo uso,nao ha um consenso sobre qual substancia seria melhor aplicada para este fim.O objetivo deste trabalho foi avaliar,comparativamnete a acao imediata de alguns produtos de larga abrangencia e tidos como eficazes,quais seja:Hibitane(clorexidina a 4 por cento)Antibac(propileno glicol,EDTA,cloroxilecol 0,3 por cento triclosan)Soapex (irgasan DP-300) sabao de coco carioca(oleo de coco de babacu,hidroxido de sodio,carbonato de sodio,carbonato de calcio,cloreto de sodio e agua)Povidine(polivinilpirrolidona-iodo ativo a 10 por cento)e alcool isopropilico a 70 por cento.Para tanto fez-se a contagem do numero de unidades formadoras de colonoas(UFC) em agar de soja e tripticaseine(TSA)das maos de dez voluntarias durante a linha base e imediatamente apos o uso dos produtos supracitados.Os dados foram analisados mediante Anova e teste de Tukey.Os resultados desta analise demonstraram que Hibitane,Povidine e alcool isopropilico a 70 por cento determinaram reducao estasticamente significativa em relacao a linha base,sendo,portante,considerados os unicos produtos eficientes,dentre aqueles testados,na reducao quantitativa da microbiota das maos


Subject(s)
Hand Disinfection/methods
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